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Reinsurance (Tables)
 12 Months Ended
Dec. 31, 2020
Reinsurance Disclosures [Abstract]  
Reinsurance Recoverable, Credit Quality Indicator
December 31, 2020
($ in thousands)CurrentPast DueTotal Reinsurance Recoverables
Financial strength rating of rated reinsurers
A++$37,464 $102 $37,566 
A+354,846 2,452 357,298 
A105,652 415 106,067 
A-2,139 — 2,139 
B++56 324 380 
B+— — — 
Total rated reinsurers$500,157 $3,293 $503,450 
Non-rated reinsurers
Federal and state pools$82,575 $— $82,575 
Other than federal and state pools2,676 568 3,244 
Total non-rated reinsurers$85,251 $568 $85,819 
Total reinsurance recoverable, gross$585,408 $3,861 $589,269 
Less: ACL(1,777)
Total reinsurance recoverable, net$587,492 
Reinsurance Recoverable, Allowance for Credit Loss
($ in thousands)December 31, 2020
Balance at beginning of year$4,400 
Cumulative effect adjustment1
(2,903)
Balance at beginning of year, as adjusted$1,497 
Current period provision for expected credit losses280 
Write-offs charged against the allowance for credit losses— 
Recoveries— 
ACL, end of year$1,777 
1See Note 3. "Adoption of Accounting Pronouncements" for additional information regarding our adoption of ASU 2016-13.
Schedule of Total Reinsurance Balances Segregated By Reinsurer
 As of
December 31, 2020		As of December 31, 2019
($ in thousands)Reinsurance Balances% of Reinsurance BalanceReinsurance Balances% of Reinsurance Balance
Total reinsurance recoverables$587,492  $573,235  
Total prepaid reinsurance premiums170,531  166,705  
Total reinsurance balance758,023  739,940  
Federal and state pools1:
    
NFIP178,532 25 %175,472 24 %
New Jersey Unsatisfied Claim Judgment Fund52,053 6 53,732 6 %
Other1,625 — 2,449 1 
Total federal and state pools232,210 31 231,653 31 
Remaining reinsurance balance$525,813 69 $508,287 69 
Munich Re Group (AM Best rated "A+")$116,885 15 $119,748 16 
Hannover Ruckversicherungs AG (AM Best rated "A+")115,084 15 107,474 15 
AXIS Reinsurance Company (AM Best rated "A")78,090 10 73,009 10 
Swiss Re Group (AM Best rated "A+")33,179 4 37,190 5 
Transatlantic Reinsurance Company (AM Best rated “A+”)24,320 3 21,824 3 
All other reinsurers158,255 22 149,042 20 
   Total reinsurers525,813 69 %508,287 69 %
Less: collateral2
(130,169)(110,549)
   Reinsurers, net of collateral$395,644 $397,738 
 1Considered to have minimal risk of default.
2Includes letters of credit, trust funds, and funds held against reinsurance recoverables.
Schedule of List Of Direct, Assumed, And Ceded Reinsurance Amounts
($ in thousands)202020192018
Premiums written:   
Direct$3,204,512 3,084,451 2,890,633 
Assumed24,288 24,339 26,250 
Ceded(455,708)(429,366)(402,597)
Net$2,773,092 2,679,424 2,514,286 
Premiums earned:   
Direct$3,108,687 2,993,157 2,808,764 
Assumed25,010 24,399 25,831 
Ceded(451,883)(420,385)(398,366)
Net$2,681,814 2,597,171 2,436,229 
Loss and loss expense incurred:   
Direct$1,822,034 1,714,880 1,706,951 
Assumed17,201 22,879 21,469 
Ceded(203,412)(186,268)(230,286)
Net$1,635,823 1,551,491 1,498,134 
Schedule of Ceded Premiums and Losses Related to Flood Operations
Ceded to NFIP ($ in thousands)202020192018
Ceded premiums written$(274,042)(266,925)(248,053)
Ceded premiums earned(271,598)(259,119)(244,238)
Ceded loss and loss expense incurred(78,993)(71,676)(144,967)